PEOPLE magazine’s Most Beautiful person of the year ,Christina Applegate, is proving that her beauty is from the inside out.

Applegate will serve as the 2009 Ambassador for Lee National Denim Day — one of the country’s largest single-day fundraisers for breast cancer

Christina is asking companies to get casual for the cause and encourage their employees to wear jeans to work on Friday, October 2 — in exchange for a $5 donation. Sounds like a fair trade to me!

About the campaign, the Samantha Who? star said:

“Lee National Denim Day is such an effective grassroots campaign and its importance has become even more real to me in this past year. By joining together on October 2, we can raise millions to support breast cancer research. It’s so simple and so powerful. I truly believe that events like this help save lives.”

To learn more and register your own group, visit DenimDay.com. Let’s raise some cash!